Mobilisation of inorganic phosphorus induced by rice straw in aggregates of a highly weathered upland soil

BACKGROUND: Microorganisms mediate biochemical transformations of phosphorus (P) in soil. This is of particular importance in highly weathered soils, which are usually P deficient. This study aimed to extend understanding of the separate role of bacteria and fungi in P transformations in aggregates...

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Published in:Journal of the science of food and agriculture 2012-03, Vol.92 (5), p.1073-1079
Main Authors: Ding, Longjun, Wu, Jinshui, Xiao, Heai, Zhou, Ping, Syers, J Keith
Format: Article
Language:English
Subjects:
Anti-Bacterial Agents - pharmacology
Antifungal Agents - pharmacology
bacteria
Bacteria - drug effects
Bacteria - metabolism
Biological and medical sciences
Biomass
Cereal and baking product industries
Cycloheximide - pharmacology
Ecosystem
Food industries
Fundamental and applied biological sciences. Psychology
Fungi
Fungi - drug effects
Fungi - metabolism
highly weathered soil
Metals - chemistry
microbial inhibitors
Microorganisms
Oryza - metabolism
Oryza - microbiology
Phosphorus
Phosphorus - analysis
Phosphorus - metabolism
phosphorus immobilisation
Soil - chemistry
soil aggregates
Soil Microbiology
Soils
Streptomycin - pharmacology
Tetracycline - pharmacology
Weather
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Summary:BACKGROUND: Microorganisms mediate biochemical transformations of phosphorus (P) in soil. This is of particular importance in highly weathered soils, which are usually P deficient. This study aimed to extend understanding of the separate role of bacteria and fungi in P transformations in aggregates of a highly weathered soil, by adding P‐stripped rice straw and microorganism inhibitors to aggregates. RESULTS: The amount of microbial biomass phosphorus (MB‐P) in the treatment with rice straw alone increased by over two‐fold during 16 days. At the end of 28 d, the amount of inorganic‐P in Fe‐, Al‐, and Ca‐bound fractions decreased, whilst the amount of organic‐P increased substantially (P < 0.01). The effect of bacterial inhibitors (tetracycline and streptomycin sulphate) on P immobilisation was very small in the early phase (0–4 d), but became pronounced after 8 days, whilst the fungal inhibitor (actidione) initially caused a decrease in P immobilisation by about 60%, but had no effect after that. CONCLUSION: Fungi and bacteria immobilise P in soil aggregates, with fungi being responsible initially. However, bacteria become dominant subsequently and immobilise P from the inorganic fractions. Copyright © 2011 Society of Chemical Industry
ISSN:0022-5142
1097-0010
DOI:10.1002/jsfa.4717